So, after performing the video/audio and sub/idx multiplex with a delay of 4300ms, DCP-o-matic found video, audio and subtitles in the MKV, ready to be burnt into a DCP. Nice to experience that sometimes, things just work. I was puzzled to find out that MKVToolNix has options to introduce a delay per individual stream very easily - and it turned out, that after multiplexing video/audio with the subtitles, the timing was perfect and stable from beginning to the end of the 1h50m feature. The only adjustment needed was a fixed delay for the subtitles, as the Bluray had about 4-5s of additional black at the start. So, as long as the video frame rate is not changed, the absolute times should match - which they did. However, I soon noticed that the subtitle timing in the idx file is based on absolute time, not frame/fractional frames. Initially, I was concerned I would need to perform an additional step of adjusting the sub/idx from 25fps to 24 fps (as the original sub/idx originates from a 25fps DVD, while the HD video comes from a 23.97 Bluray. if it contains Dolby TrueHD tracks or certain anomalies). This can be quite handy if you have a multistream MKV that causes trouble in DOM (e.g. There is also a windows version available. MKVToolNix is the SwissArmyKnife for getting individual streams of video, audio, and subtitles into and out of MKV containers. This was done using the OS X GUI version of MKVToolNix (what a nerdish name for such a useful and capable piece of software). While DOM is not able to work with sub/idx files directly (WHY?) - I was able to multiplex the sub/idx file into a HD/Bluray derived MKV file (video + DTS audio). This gave me a sub (bitmap) file and idx (config/timing) file. I extraced the VOB/DVD bitmap subtitles with iMKVextract. But in the end, it turned out to be actually easy, using only two free applications running under OS X. Although it took me a while to research software and workflows.
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